Model Deformation Measurement

It is very important to know the shape of the model during a test in the wind tunnel for the following reasons:

To ensure that the model is accurately representing the full scale aircraft.

To make sure that the geometry of the model under test is known to allow meaningful comparison with CFD work.

Non-intrusive optical techniques have been developed to enable accurate model shapes to be measured when the model is under aerodynamic loads. ARA has undertaken a series of tests to determine the accuracy and repeatability of this measurement technique.

The tests included static deformation tests undertaken under laboratory conditions together with a wind tunnel test. The performance of the system was found to be very high and provided data of the required standard. Typical output acquired during the test is shown above.